Monograph of the genus <i>Helix</i>. In: <i>Conchologia iconica, or, illustrations of the shells of molluscous animals</i>, vol. 7, pls. 1-210 and unpaginated text. L. Reeve & Co., London. [publication dates: pls. 1-6, Mar. 1851; 7-14, Apr. 1851; 15-22, May 1851; 23-30, Jun. 1851; 31-38, Jul. 1861; 39-46, Sept. 1851; 47-54, Oct. 1851; 55-62, Dec. 1851; 63-70, Jan. 1852; 71-78, Feb. 1852; 79-86, Mar. 1852; 87-94, Apr. 1852; 95-102, May 1852; 103-110, Jun. 1852; 111-126, Aug. 1852; 127-134, Oct. 1852 [pl. 133 as “Oct. 1851”]; 135-142, Nov. 1852; 143-146, Dec. 1852; 147-150, Feb. 1853; 151-154, Apr. 1853; 155-162, May 1853; 163-166, Jun. 1853; 167-170, Jul. 1853; 171-174, Oct. 1853; 175, 176, Apr. 1854; 177, May 1854; 178-185, Jun. 1854; 186-189, Jul. 1854; 190-193, Aug. 1854; 194, 195, Sept. 1854; 196-210, Dec. 1854]